let's compare vice president joe biden's performance in his debates in 2008 and in 2012. here he is in attack dog mode against congressman paul ryan last year. >> we have these sanctions in place. it's in spite of their opposition -- >> oh, god. >> they've given 20 waivers to this sanction. under a romney administration, we will have credibility on this issue. >> vice president biden? >> it's incredible. when governor romney's asked about it, he's said, we've got to keep these sanctions. and he's said, you're talking about doing more. are you going to go to war? is that what you want to do? this is a bunch of stuff. with all do respect, that's a bunch of malarkey. >> stuff, malarkey, laughing and mocking, but here he is four years older, shall we say, holding himself back as sarah palin goes on the attack. pay attention to joe biden's face. >> barack obama and senator o'biden, you've said no to everything in trying to find a solution to the domestic energy that we're in. now barack obama and senator biden also voted for the largest tax increases in u.s. history. barack ha